module mux_2to1 #(
	parameter DATA_SIZE = 4
) (
	D_IN0,D_IN1,SEL,D_OUT
);
	input [DATA_SIZE-1:0]D_IN0,D_IN1;
	input SEL;
	output [DATA_SIZE-1:0]D_OUT;
	assign D_OUT = SEL? D_IN1:D_IN0;
endmodule